EP3270490A1 - Pump assembly for a pump, pump and method for reducing or eliminating interference and/or vibrations for pumps - Google Patents
Pump assembly for a pump, pump and method for reducing or eliminating interference and/or vibrations for pumps Download PDFInfo
- Publication number
- EP3270490A1 EP3270490A1 EP17020295.6A EP17020295A EP3270490A1 EP 3270490 A1 EP3270490 A1 EP 3270490A1 EP 17020295 A EP17020295 A EP 17020295A EP 3270490 A1 EP3270490 A1 EP 3270490A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- motor
- housing
- motor shaft
- stabilizing element
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 210000001124 body fluid Anatomy 0.000 description 1
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- 229910010293 ceramic material Inorganic materials 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0044—Pulsation and noise damping means with vibration damping supports
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
- F04B43/043—Micropumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
- F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
- F04B45/047—Pumps having electric drive
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/09—Flow through the pump
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
- H02K2205/03—Machines characterised by thrust bearings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
- H02K7/075—Means for converting reciprocating motion into rotary motion or vice versa using crankshafts or eccentrics
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Definitions
- the invention relates to a pump assembly for a pump, in particular for a miniature pump, more particularly for a miniature diaphragm pump, preferably with a delivery volume of less than 10 l / min, more preferably less than 1000 ml / min, particularly preferably with a delivery volume of less than 500 ml / min, with an electric motor, in particular a DC motor, and with a housing unit, wherein the electric motor has a freewheeled by a motor housing of the electric motor motor shaft and the motor housing is connected to the housing unit and wherein the motor shaft in the motor housing with an axial wave play is stored.
- a sliding bearing of the motor shaft is provided in the motor housing.
- the present invention relates to a pump, in particular a miniature pump, more particularly a miniature diaphragm pump, preferably with a delivery volume of less than 10 l / min, more preferably less than 1000 ml / min, more preferably with a delivery volume of less than 500 ml / min, with a pump assembly of the type described above.
- the invention relates to a method for reducing or eliminating noise and / or vibration in pumps, especially in miniature pumps, more particularly in miniature diaphragm pumps, wherein the pump preferably has a delivery volume of less than 10 l / min, more preferably less than 1000 ml / min, more preferably less than 500 ml / min, wherein the pump comprises a pump assembly with an electric motor, in particular with a DC motor, and with a housing unit, wherein the electric motor has a freestanding by a motor housing of the electric motor motor shaft and the Motor housing is connected to the housing unit and wherein the motor shaft is mounted in the motor housing with an axial shaft clearance.
- miniature pumps are used in the treatment of sleep disorders / sleep apnea syndrome, wherein the patient must wear a nose or face mask during sleep, which is connected via a hose to a miniature pump. The air becomes active pumped through the nose into the lungs so that the airway remains open over the overpressure. In wound drainage, a vacuum is applied to a wound dressing with a miniature pump to improve wound healing.
- Miniature pumps of the type in question are also used, for example, in surgical aspirators for medical suction, in medical storage mattresses and in pipettes.
- miniature pumps can be used in most portable devices for gas analysis (respiratory gases, flue gases, etc.). Even outside medical technology, for example in the field of dental technology, in coffee machines or in industrial applications, miniature pressure or miniature vacuum pumps are used. It is understood that the aforementioned areas of application are not exhaustive.
- Miniature pumps must meet the highest requirements. This includes in particular a high performance with a small size. Due to the requirements of a small size and for reasons of economy, miniature pumps often electric motors are used as a drive unit, the motor or drive shafts are mounted in a motor housing with an axial shaft play. In particular, no ball bearing is provided in the rule, which can absorb axial forces. In many small electric motors are, for example, sintered bearings, which serve as sliding bushes in linear bearings. If there is a change in the position of the motor shaft relative to the horizontal position due to movements of the pump and an axial load is exerted on the motor shaft, it may lead to a displacement of the motor shaft in the interior of the motor housing.
- the object of the present invention is to provide a pump assembly, a pump with such a pump assembly and a method, with which a low-vibration and low-noise engine operation is ensured with the use of particularly cost-effective electric motors with axially movably mounted motor shafts for each installation and / or position of use of the pump.
- a reduction or elimination of vibrations and / or noise should also be achieved in a structurally simple and cost-effective manner with the same size and performance of the pump as possible.
- the pump assembly comprises at least one arranged outside the motor housing stabilizing element for reducing or eliminating the axial shaft clearance of the motor shaft, wherein the motor shaft by the stabilizing element directly, that is contact-bound, or indirectly, that is contactless and / or contactless, with a on the Motor shaft acting axial compressive force or axial tensile force is applied.
- the motor shaft is passed through the motor housing on the side of the housing unit connected to the motor housing.
- the force required to reduce the axial shaft clearance of the motor shaft is exerted on the free end of the motor shaft, in particular on the front side.
- the motor shaft is mounted in the motor housing with an axial shaft play and / or performed with an axial wave play in the motor housing. This means that the motor shaft is (slightly) displaceable relative to the motor housing without the application of force by the stabilizing element.
- the invention thus relates to the use of standard motors, in which due to the operation of the pump to a relative movement between the motor shaft on the one hand and an outer casing of the electric motor on the other hand can come. This relative movement is inventively prevented by the at least one stabilizing element.
- the electric motor for driving the pump or the motor shaft can essentially consist of a fixed part (stator) and a rotating part (rotor), the stator and the rotor having permanent magnets or electrical windings which generate electric fields.
- the rotor is mounted on the motor shaft.
- electrical connections can be provided to at least one electrical consumer or electrical energy supplier. The electrical connections are preferably guided on a side facing away from the housing unit from the motor housing. Otherwise, that is, with the exception of the bushings for the motor shaft and the electrical connections, the motor housing is preferably designed as self-contained.
- the stabilizing element exerts a force, in particular an axial force, which acts directly or indirectly on the free end of the motor shaft accommodated in the housing unit.
- the motor housing preferably forms an outer housing of the electric motor and, in addition to electromotive components, such as stator and rotor, in particular also shaft bearing of the motor shaft.
- the electromotive components of the electric motor and the shaft bearings of the motor shaft are in particular encapsulated by the motor housing.
- the motor shaft extends for the most part within the motor housing, but is guided with a shaft end through an outer wall or end face of the motor housing, wherein the guided-shaft end is preferably arranged within the housing unit.
- the housing unit preferably encloses completely the free end of the motor shaft.
- the housing unit may in particular be releasably connected to the motor housing, for example by screwing. In principle, however, a fixed connection between the housing unit and the motor housing may be provided.
- the housing unit is preferably connected exclusively in the region of the outer wall or front side with the motor housing, on which the motor shaft is guided out of the motor housing.
- the housing unit surrounds the motor housing un this particular "encapsulates".
- the housing unit may be formed in one or more parts.
- the housing unit is a particular injection molded plastic component.
- the housing unit may be detachably or fixedly connected to the motor housing.
- the invention relates to the retrofitting of a standard motor, the motor shaft of which is guided in play in the motor housing, for operation in a pump assembly in such a way that the motor shaft in the pump assembly is arranged substantially free of play.
- the basically possible axial shaft play of the motor shaft of the electric motor is thus to be distinguished from the backlash-free arrangement of the motor shaft in the installed state of the electric motor and operating state of the pump or within the housing unit.
- outside the motor housing all embodiments are to be understood, in which the stabilizing element is arranged outside of the motor shaft surrounding the interior of the motor housing.
- the term “outside of the motor housing” also includes in particular such embodiments in which the stabilizing element is integrated in the motor housing or forms part of the motor housing, but the motor shaft is acted upon by the stabilizing element from outside the motor housing with an axial compressive force or axial tensile force, to reduce or completely eliminate a design-related shaft play of the motor shaft.
- the invention is based on the basic idea to provide a storage or support bearing of the motor shaft from outside the motor housing by the stabilizing element.
- the electric motor with motor housing and play-loaded motor shaft thereby provides a constructive preassembled module or a separate component integrated in the pump module.
- a structural modification of the structure of the electric motor is not required to reduce or eliminate the immanent wave play of the motor shaft. This can also be done when using cost-effective electric motors having a motor shaft movably mounted in the axial direction, exclude or at least reduce disturbing noises or vibrations for each installation and / or use position of the pump, which may otherwise occur during motor operation of such motors by relative movements of the motor shaft to the motor housing.
- At least one stabilizing element may be provided, which is fastened in and / or on the housing unit and / or forms part of the housing unit.
- at least one stabilizing element may be provided which is connected to the motor shaft and rotatable with the motor shaft.
- at least one stabilizing element can be provided, which is fastened in and / or on the motor housing and / or forms part of the motor housing.
- the stabilizing element can preferably be a separate component which is connected to the housing unit or the motor shaft or the motor housing.
- the stabilizing element can also be formed by a correspondingly formed housing section of the housing unit or of the motor housing.
- the motor shaft is acted upon by the stabilizing element with a compressive or tensile force acting in the axial direction of the motor shaft. Due to the exertion of force in the axial direction occurring during engine operation and attributable to an immanent axial play of the motor shaft noise and / or vibrations can be significantly reduced or even completely eliminated.
- the forces can lead to a bias of the motor shaft in the motor housing and / or to an axial displacement of the motor shaft in the motor housing. By pressure or tensile forces, the motor shaft can be brought into a position in which it no longer rests against fixed components of the electric motor during engine operation.
- the motor shaft can be pressed by the stabilizing element with a shaft end against a shaft bearing in the motor housing, so that no relevant noise or vibration occur during engine operation.
- the motor shaft is pressed due to the action of the stabilizing element against an opposite to the drive side of the motor in the interior of the motor housing arranged shaft bearing or pulled against an internal shaft bearing on the drive side of the electric motor.
- the method according to the invention provides that an axial compressive or tensile force acting on the motor shaft is generated from the outside in order to reduce or eliminate the axial shaft clearance. This can be the occurrence of vibration and / or noise during pump operation in a very effective manner and taking advantage of the available inside the housing unit free space or even completely eliminate it, without a constructive change of the assembly "electric motor" is required.
- the stabilizing element may be spring-loaded or there is provided a spring means as a stabilizing element which generates a spring force acting on the motor shaft in the axial direction of the motor shaft.
- a housing part of the housing unit or a housing section of the motor housing can be mechanically coupled to the motor shaft.
- a spring element between a housing part of the housing unit and the eccentric motor shaft may be provided to bias the motor shaft accordingly.
- the stabilizing element on the drive side of the electric motor and / or in a free-standing end face of the motor shaft opposite housing part of the housing unit is arranged.
- the stabilizing element may be arranged on and / or in a housing cover or a housing cap which is releasably and / or displaceably connected to at least one other housing part of the housing unit.
- the free-standing, protruding through the motor housing of the electric motor part of the motor shaft may be encapsulated in the housing unit when the housing cover is brought into a closed and assembled position.
- the stabilizing element and the free end of the motor shaft are protected against contamination.
- the attachment of the stabilizing element to and / or in one of the motor shaft frontally opposite Housing part allows in a structurally simple manner and with a constant size of the pump, the transmission of sufficiently large axial pressure and / or tensile forces from the stabilizing element on the motor shaft.
- the stabilizing element is securely held on or in the housing part.
- the stabilizing element is directly or indirectly against the end face of the motor shaft. It comes then to a contact-bound reduction of the axial shaft clearance, wherein the motor shaft is urged by the stabilizing element on the side facing away from the drive side of the electric motor side of the motor and / or acted upon by an acting in the axial direction to the opposite side motor bias.
- the stabilizing element for the transmission of force can abut substantially punctually against the motor shaft.
- the stabilizing element may be spherical.
- the stabilizing element is designed tapering in the direction of the drive side of the electric motor, so that the stabilizing element acts with its tip against the motor shaft. This also ensures a low sliding friction resistance during rotation of the motor shaft.
- the resistance caused by sliding friction between the stabilizing element and the motor shaft can be kept low by choosing a low-friction material pairing.
- the stabilizing element may in this context consist of a material having good sliding and wear properties, for example of polyoxymethylene (POM) and / or polytetrafluoroethylene (PTFE).
- POM polyoxymethylene
- PTFE polytetrafluoroethylene
- the aforementioned materials also allow a cost-effective production of the stabilizing element.
- the stabilizing element can also be rotatably held or mounted on the housing part. During engine operation, it may then due to the voltage applied to the stabilizing element motor shaft to a relative movement between the stabilizing element come and the housing part, wherein the stabilizing element can be moved with the motor shaft.
- a stabilizing element may be held on a housing portion of the motor housing, which abuts against an eccentric connected to the free end of the motor shaft and / or acts against the eccentric. A pressure force can then be exerted on the eccentric via the stabilizing element in order to press the motor shaft in a direction away from the motor housing and thus reduce the axial shaft play.
- the stabilizing element may also here preferably be punctiform, more preferably formed as a ball.
- the stabilizing element may also be rotatably held on the housing portion of the motor housing and / or consist of a low-wear material.
- the stabilizing element may be acted upon by a spring force.
- the stabilizing element can be biased by a spring element in the axial direction towards the motor shaft. In order for an effective contact between the stabilizing element and the motor shaft is always guaranteed, even if it comes to a wear on the stabilizing element due to a rotational relative movement between the motor shaft and the voltage applied to the motor shaft occurring during motor operation.
- a diaphragm made of an elastic plastic may be provided on a housing part of the housing unit, which bears against the stabilizing element and through which the stabilizing element is pressed in the direction of the motor shaft.
- the housing part can be made as such from an elastomeric plastic and bias the stabilizing element.
- a spring element for example a helical spring, may be provided in order to press the stabilizing element against the motor shaft.
- a magnetic coupling may be provided between the motor shaft and the housing unit and / or between the motor shaft and the motor housing to reduce or eliminate the axial shaft clearance of the motor shaft.
- the coupling is carried out from outside the self-contained motor housing on the guided out of the motor housing shaft end of the motor shaft.
- the motor shaft is held without contact in a specific axial position to reduce or eliminate the wave play by magnetic field forces.
- a magnetic field is generated in the axial direction that attracts or repels the motor shaft in order to reduce and, preferably, eliminate the axial wave play inherent in the "electric motor" assembly. Due to the magnetic coupling a frictionless and thus wear and almost loss of power transmission of the forces required to reduce or eliminate the axial shaft clearance of the motor shaft is possible. Incidentally, a magnetic coupling in a simple way constructively design and manufacture cost-effective.
- At least one permanent magnet for example formed as a disk magnet or ring magnet, may be provided as the stabilizing element, or the stabilizing element may comprise at least one such permanent magnet.
- An electromagnetic coupling is possible in principle.
- a magnetic stabilizing element can be arranged or held in and / or on the housing unit and / or in and / or on the motor housing, or a magnetic stabilizing element can be connected directly to the motor shaft.
- at least two magnetic stabilizing elements may cooperate, or a stabilizing element may cooperate with a portion or portion of the housing unit or the motor housing or motor shaft made of a ferromagnetic material.
- a concentric with the motor shaft arranged and fixedly connected to the motor shaft ring magnet may be provided, which cooperates with a further fixed to the housing unit or the motor housing permanent magnet.
- Opposing magnetic poles of the stabilizing elements may have the same or opposite polarity to push the stabilizing elements away from one another or to attract one another.
- a permanent magnet as a stabilizing element can be arranged concentrically to the motor shaft. Moreover, it is possible that a permanent magnet with the additional function of a balance weight is arranged radially offset from the motor shaft. In an eccentric pump with an eccentric connected to the free end of the motor shaft, at least one magnet can be integrated in the eccentric at the location of a stabilizing element. If balance weights in the eccentric are made of a ferromagnetic material, they can be combined with one with the Housing unit or the motor housing associated permanent magnetic stabilizing element cooperate to achieve a magnetic coupling between the housing unit and the motor shaft or between the motor housing and the motor shaft.
- a disc of a ferromagnetic material may be fixedly connected, which is attracted for example by a permanent magnet stabilizing element to the housing unit or by a permanent magnet stabilizing element on the motor housing, thereby moving the motor shaft in a certain direction and the Reduce axial play of the motor shaft.
- Fig. 1 shows schematically and in section a pump assembly 1 for a miniature diaphragm pump or eccentric diaphragm pump, which has an electric motor 2 and a multi-part housing unit 3.
- the membrane pump is suitable, for example, as a drainage pump for aspirating body fluids or gases in the wound area.
- a part of the housing unit 3 forms a housing cover 4.
- the electric motor 2 has a motor shaft 5 freestanding by a motor housing, not shown in detail, of the electric motor 2.
- the electric motor 2 with motor shaft 5 and motor housing forms an independent unit, which in Fig. 1 is shown in a mounting position.
- the motor housing is screwed to the housing unit 3.
- the motor shaft 5 is mounted in the motor housing with an axial shaft clearance, so in particular a sliding bearing and no ball bearing of the motor shaft 5 is provided, which can also absorb axial forces.
- the motor housing has on a drive side of the electric motor 2 a housing opening for the motor shaft 5, through which the motor shaft 5 is passed.
- the bearing of the motor shaft 5 can be made via sintered bearings, which are designed only for receiving radial forces.
- electric motors 2 5 components may be provided on the motor shaft, which rotate together with the motor shaft 5 and, depending on the arrangement and orientation of the electric motor 2 during pump operation axially against the motor housing or a shaft bearing in the motor housing work. This can lead to disturbing vibrations and noises.
- vibrations are transmitted to the housing unit 3 and, especially when a body-mounted arrangement of the diaphragm pump is required during pump operation, perceived as disturbing.
- the illustrated pump assembly 1 has a stabilizing element 6, which in the form of a ball as a support bearing for the motor shaft. 5 serves and immediately abuts the end face against the exposed end of the motor shaft 5.
- the stabilizing element 6 the motor shaft 5 in the axial direction X ( Fig. 1 ) is urged to the drive side of the electric motor 2 opposite side or it is a bias voltage generated in this direction, which leads to a reduction of the axial shaft clearance of the motor shaft 5 in the motor housing for h r.
- the stabilizing element 6 is held with a membrane 7 made of an elastic plastic on the housing cover 4 and biased in the direction of the motor shaft 5. At the location of the membrane 7, another spring means may be provided.
- the membrane 7 is connected to the housing cover 4.
- a support ring 8 may be provided of metal, which is inserted or inserted into a membrane pocket 9.
- the motor shaft is rotatably connected in a conventional manner with an eccentric 10.
- the eccentric 10 is also connected via a ball bearing 11 in a conventional manner with a connecting rod 12 to establish a connection with a membrane of the diaphragm pump, not shown, and to ensure the pump function.
- FIG. 2 an alternative embodiment of a pump assembly 1 of a diaphragm pump is shown.
- a pump assembly 1 of a diaphragm pump is shown.
- like reference numerals in the Fig. 1 and 2 same components, which is why reference is made to the preceding description of these components at this point.
- a magnetic coupling between a provided on the housing cover 4 inside stabilizing element 13 and a concentric with the motor shaft 5 arranged further stabilizing element 14 is provided.
- the further stabilizing element 14 can also be arranged with the additional function of a balance weight offset from the motor shaft 5.
- the stabilizing element 13 is preferably a disc magnet.
- the further stabilizing element 14 is preferably a ring magnet. Since the stabilizing elements 13, 14 are equally polarized on mutually facing sides, the motor shaft 5 is repelled by the stabilizing element 13 and thus urged in the direction X to the opposite side of the drive side of the electric motor 2 motor side. As a result, an axial bearing clearance of the motor shaft 4 is reduced in the motor housing, preferably completely eliminated.
- the stabilizing element 13 and the further stabilizing element 14 may also be differently polarized on the sides facing each other, so that the motor shaft 5 is pulled in the direction of the housing cover 4, depending on the structural design of the shaft bearing in Electric motor 2 also to reduce, preferably to complete elimination, an immanenten axial bearing clearance of the motor shaft 5 can lead within the motor housing.
- the further stabilizing element 14 is integrated in the eccentric 10 frontally.
- the eccentric 10 has a corresponding annular groove into which the further stabilizing element 14 is inserted.
- the concentric arrangement of the ring magnet contributes to a high level of smoothness of the electric motor 2.
- the eccentric 10 may have radially offset from the motor shaft arranged end side balancing weights, which are provided as stabilizing elements and can be formed by permanent magnets. This also makes it possible to achieve a magnetic coupling between the housing unit 3 and the motor shaft 5.
- a stabilizing element 13, 14, which cooperates with a ferromagnetic region, portion or part of the housing cover 4 or the motor shaft 5.
- a disk made of a ferromagnetic material provided on the inside of the housing cover 4 can be arranged, which results in the motor shaft 5 being counter to that in FIG Fig. 2 shown axial direction X is pulled in the direction of the housing cover 4.
- a correspondingly formed ferromagnetic region could also be provided on the motor housing.
- the further stabilizing element 14 at a suitable location a disc connected to the motor shaft 5 made of a ferromagnetic material, so that the disc and thus the motor shaft 5 is attracted to the magnetic stabilizing element 13 on the housing cover 4 ,
- a magnetic field can also be generated between a permanent magnet fixed to the eccentric 10 and a permanent magnet fixed to the motor housing, in order to reduce or eliminate axial play of the motor shaft 5.
- FIG. 3 another embodiment of a pump assembly 1 for an eccentric diaphragm pump is shown again with like reference numerals in the Fig. 1 . 2 and 3 denote the same components, which is why reference is made at this point to the preceding description of these components.
- a disc 15 is provided, which is fixed radially inwardly fixed to the motor shaft 5 and radially outboard fixed to a ring magnet as a stabilizing element 16.
- the disk 15 is disposed adjacent to the engine housing at the free-standing end of the motor shaft 5 guided by the motor housing of the electric motor 2.
- the motor housing can be made of a magnetizable (ferromagnetic) Material exist.
- a cover plate or mounting screws or the like may consist of a magnetizable material. This results in that the motor shaft 5 is pulled in the axial direction X to the motor housing, which in turn can lead to a reduction or elimination of immanenten axial shaft play.
- a further magnetic stabilizing element can also be provided here in the region of the motor housing in order to attract (or repel) the stabilizing element 16 connected to the motor shaft 5, and thus to adjust the motor shaft 5 in one or the other direction to effect.
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Abstract
Dargestellt und beschrieben ist eine Pumpenbaugruppe (1) für eine Pumpe, insbesondere für eine Miniaturpumpe, mit einem Elektromotor (2) und mit einer Gehäuseeinheit (3), wobei der Elektromotor (2) eine durch ein Motorgehäuse des Elektromotors (2) freistehende Motorwelle (5) aufweist und das Motorgehäuse mit der Gehäuseeinheit (3) verbunden ist und wobei die Motorwelle (5) im Motorgehäuse mit einem axialen Wellenspiel gelagert ist. Erfindungsgemäß ist wenigstens ein außerhalb des Motorgehäuses angeordnetes Stabilisierungselement (6, 13, 14, 16) zur Verringerung oder zur Beseitigung des axialen Wellenspiels der Motorwelle (5) vorgesehen, wobei die Motorwelle (5) durch das Stabilisierungselement (6, 13, 14, 16) mit einer auf die Motorwelle (3) wirkenden axialen Druckkraft oder axialen Zugkraft beaufschlagt wird. Shown and described is a pump assembly (1) for a pump, in particular for a miniature pump, with an electric motor (2) and with a housing unit (3), wherein the electric motor (2) by a motor housing of the electric motor (2) freestanding motor shaft ( 5) and the motor housing is connected to the housing unit (3) and wherein the motor shaft (5) is mounted in the motor housing with an axial shaft play. According to the invention, at least one stabilizing element (6, 13, 14, 16) arranged outside the motor housing is provided for reducing or eliminating the axial shaft clearance of the motor shaft (5), the motor shaft (5) being guided by the stabilizing element (6, 13, 14, 16 ) is acted upon by an axial compressive force or axial tensile force acting on the motor shaft (3).
Description
Die Erfindung betrifft eine Pumpenbaugruppe für eine Pumpe, insbesondere für eine Miniaturpumpe, weiter insbesondere für eine Miniatur-Membranpumpe, vorzugsweise mit einem Fördervolumen von weniger als 10 l/min, weiter vorzugsweise von weniger als 1000 ml/min, besonders bevorzugt mit einem Fördervolumen von weniger als 500 ml/min, mit einem Elektromotor, insbesondere einem Gleichstrommotor, und mit einer Gehäuseeinheit, wobei der Elektromotor eine durch ein Motorgehäuse des Elektromotors freistehende Motorwelle aufweist und das Motorgehäuse mit der Gehäuseeinheit verbunden ist und wobei die Motorwelle im Motorgehäuse mit einem axialen Wellenspiel gelagert ist. Insbesondere ist eine Gleitlagerung der Motorwelle im Motorgehäuse vorgesehen.The invention relates to a pump assembly for a pump, in particular for a miniature pump, more particularly for a miniature diaphragm pump, preferably with a delivery volume of less than 10 l / min, more preferably less than 1000 ml / min, particularly preferably with a delivery volume of less than 500 ml / min, with an electric motor, in particular a DC motor, and with a housing unit, wherein the electric motor has a freewheeled by a motor housing of the electric motor motor shaft and the motor housing is connected to the housing unit and wherein the motor shaft in the motor housing with an axial wave play is stored. In particular, a sliding bearing of the motor shaft is provided in the motor housing.
Darüber hinaus betrifft die vorliegende Erfindung eine Pumpe, insbesondere eine Miniaturpumpe, weiter insbesondere eine Miniatur-Membranpumpe, vorzugsweise mit einem Fördervolumen von weniger als 10 l/min, weiter vorzugsweise von weniger als 1000 ml/min, besonders bevorzugt mit einem Fördervolumen von weniger als 500 ml/min, mit einer Pumpenbaugruppe der oben beschriebenen Art.Moreover, the present invention relates to a pump, in particular a miniature pump, more particularly a miniature diaphragm pump, preferably with a delivery volume of less than 10 l / min, more preferably less than 1000 ml / min, more preferably with a delivery volume of less than 500 ml / min, with a pump assembly of the type described above.
Schließlich betrifft die Erfindung ein Verfahren zur Verringerung oder Beseitigung von Störgeräuschen und/oder Vibrationen bei Pumpen, insbesondere bei Miniaturpumpen, weiter insbesondere bei Miniatur-Membranpumpen, wobei die Pumpe vorzugsweise ein Fördervolumen von weniger als 10 l/min, weiter vorzugsweise von weniger als 1000 ml/min, besonders bevorzugt von weniger als 500 ml/min, aufweist, wobei die Pumpe eine Pumpenbaugruppe mit einem Elektromotor, insbesondere mit einem Gleichstrommotor, und mit einer Gehäuseeinheit aufweist, wobei der Elektromotor eine durch ein Motorgehäuse des Elektromotors freistehende Motorwelle aufweist und das Motorgehäuse mit der Gehäuseeinheit verbunden ist und wobei die Motorwelle im Motorgehäuse mit einem axialen Wellenspiel gelagert ist.Finally, the invention relates to a method for reducing or eliminating noise and / or vibration in pumps, especially in miniature pumps, more particularly in miniature diaphragm pumps, wherein the pump preferably has a delivery volume of less than 10 l / min, more preferably less than 1000 ml / min, more preferably less than 500 ml / min, wherein the pump comprises a pump assembly with an electric motor, in particular with a DC motor, and with a housing unit, wherein the electric motor has a freestanding by a motor housing of the electric motor motor shaft and the Motor housing is connected to the housing unit and wherein the motor shaft is mounted in the motor housing with an axial shaft clearance.
Die Einsatzbereiche von Miniaturpumpen sind vielfältig. Beispielsweise im Bereich medizintechnischer Anwendungen kommen Miniaturpumpen bei der Therapierung von Schlafstörungen/dem Schlafapnoesyndrom zum Einsatz, wobei der Patient während des Schlafs eine Nasen- oder Gesichtsmaske tragen muss, die über einen Schlauch an eine Miniaturpumpe angeschlossen ist. Die Luft wird dabei aktiv durch die Nase in die Lunge gepumpt, so dass der Atemweg über den Überdruck offenbleibt. Bei der Wunddrainage wird mit einer Miniaturpumpe ein Wundverband mit Vakuum beaufschlagt, um die Wundheilung zu verbessern. Miniaturpumpen der in Rede stehenden Art werden darüber hinaus beispielsweise in Operationssaugern für die medizinische Absaugung, in medizinischen Lagerungsmatratzen und in Pipetten eingesetzt. Ebenfalls können Miniaturpumpen in meist tragbaren Geräten zur Gasanalyse (Atemgase, Rauchgase etc.) zum Einsatz kommen. Auch außerhalb der Medizintechnik, beispielsweise im Bereich der Dentaltechnik, in Kaffeemaschinen oder im industriellen Anwendungsbereich, kommen Miniaturdruck- oder Miniaturvakuumpumpen zum Einsatz. Es versteht sich, dass die vorgenannten Anwendungsbereiche nicht abschließend zu verstehen sind.The application areas of miniature pumps are diverse. For example, in the field of medical applications miniature pumps are used in the treatment of sleep disorders / sleep apnea syndrome, wherein the patient must wear a nose or face mask during sleep, which is connected via a hose to a miniature pump. The air becomes active pumped through the nose into the lungs so that the airway remains open over the overpressure. In wound drainage, a vacuum is applied to a wound dressing with a miniature pump to improve wound healing. Miniature pumps of the type in question are also used, for example, in surgical aspirators for medical suction, in medical storage mattresses and in pipettes. Also, miniature pumps can be used in most portable devices for gas analysis (respiratory gases, flue gases, etc.). Even outside medical technology, for example in the field of dental technology, in coffee machines or in industrial applications, miniature pressure or miniature vacuum pumps are used. It is understood that the aforementioned areas of application are not exhaustive.
Miniaturpumpen müssen höchsten Anforderungen genügen. Hierzu zählt insbesondere eine hohe Leistungsfähigkeit bei geringer Baugröße. Aufgrund der Anforderungen an eine geringe Baugröße und aus Wirtschaftlichkeitsgründen werden für Miniaturpumpen oft Elektromotoren als Antriebseinheit eingesetzt, deren Motor- bzw. Antriebswellen in einem Motorgehäuse mit einem axialen Wellenspiel gelagert sind. Insbesondere ist in der Regel keine Kugellagerung vorgesehen, die axiale Kräfte aufnehmen kann. In vielen kleinen Elektromotoren befinden sich beispielsweise Sinterlager, die als Gleitbuchsen in Linearlagern dienen. Kommt es aufgrund von Bewegungen der Pumpe zu einer Veränderung der Lage der Motorwelle relativ zur Horizontallage und wird eine axiale Last auf die Motorwelle ausgeübt, so kann es zu einer Verschiebung der Motorwelle im Inneren des Motorgehäuses kommen. Teile der Motorwelle können dann in axialer Richtung gegen das Motorgehäuse oder Teile davon oder auch gegen ein zur radialen Wellenlagerung vorgesehenes Gleitlager wirken, was beim Motorbetrieb zu Vibrationen der Motorwelle und/oder zu Störgeräuschen führen kann. Vibrationen und die Geräuschentwicklung sind bei Miniaturpumpen unerwünscht, insbesondere, wenn die Pumpen körpernah eingesetzt werden, was vor allem für Bereiche der Medizintechnik gilt. Bei Miniatur-Membranpumpen ist daher im Stand der Technik bereits versucht worden, das Geräusch- und Vibrationsverhalten der Motorwelle durch Vorspannen des Pleuels, welches auf eine Membran der Membranpumpe wirkt und über einen Exzenter mit der Motorwelle verbunden ist, insbesondere durch Schiefstellen des Pleuels, zu beeinflussen und Vibrationen und/oder Störgeräusche zu verringern. Diese Lösung hat sich jedoch in der Praxis als wenig langzeitstabil erwiesen.Miniature pumps must meet the highest requirements. This includes in particular a high performance with a small size. Due to the requirements of a small size and for reasons of economy, miniature pumps often electric motors are used as a drive unit, the motor or drive shafts are mounted in a motor housing with an axial shaft play. In particular, no ball bearing is provided in the rule, which can absorb axial forces. In many small electric motors are, for example, sintered bearings, which serve as sliding bushes in linear bearings. If there is a change in the position of the motor shaft relative to the horizontal position due to movements of the pump and an axial load is exerted on the motor shaft, it may lead to a displacement of the motor shaft in the interior of the motor housing. Parts of the motor shaft can then act in the axial direction against the motor housing or parts thereof or against a provided for radial shaft bearing plain bearing, which can lead to vibrations of the motor shaft and / or noise during engine operation. Vibrations and noise are undesirable in miniature pumps, especially when the pumps are used close to the body, which is especially true for medical technology. In miniature diaphragm pumps has therefore been tried in the prior art, the noise and vibration behavior of the motor shaft by biasing the connecting rod, which acts on a membrane of the diaphragm pump and is connected via an eccentric with the motor shaft, in particular by skewing the connecting rod to affect and reduce vibration and / or noise. However, this solution has proven to be less long-term stable in practice.
Aufgabe der vorliegenden Erfindung ist es, eine Pumpenbaugruppe, eine Pumpe mit einer solchen Pumpenbaugruppe und ein Verfahren zur Verfügung zu stellen, mit denen ein vibrations- und geräuscharmer Motorbetrieb bei Verwendung von insbesondere kostengünstigen Elektromotoren mit axial beweglich gelagerten Motorwellen für jede Einbau- und/oder Gebrauchslage der Pumpe gewährleistet ist. Eine Verringerung oder Beseitigung von Vibrationen und/oder Störgeräuschen soll darüber hinaus in konstruktiv einfacher und kostengünstiger Weise bei möglichst gleichbleibender Baugröße und Leistungsfähigkeit der Pumpe erreicht werden.The object of the present invention is to provide a pump assembly, a pump with such a pump assembly and a method, with which a low-vibration and low-noise engine operation is ensured with the use of particularly cost-effective electric motors with axially movably mounted motor shafts for each installation and / or position of use of the pump. A reduction or elimination of vibrations and / or noise should also be achieved in a structurally simple and cost-effective manner with the same size and performance of the pump as possible.
Die vorgenannten Aufgaben werden durch eine Pumpenbaugruppe mit den Merkmalen von Anspruch 1, durch eine Pumpe mit einer solchen Pumpenbaugruppe gemäß Anspruch 9 und durch ein Verfahren zur Verringerung oder Beseitigung von Vibrationen und/oder Störgeräuschen bei Pumpen mit den Merkmalen von Anspruch 10 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.The above objects are achieved by a pump assembly having the features of
Die erfindungsgemäße Pumpenbaugruppe weist wenigstens ein außerhalb des Motorgehäuses angeordnetes Stabilisierungselement zur Verringerung oder zur Beseitigung des axialen Wellenspiels der Motorwelle auf, wobei die Motorwelle durch das Stabilisierungselement unmittelbar, das heißt kontaktgebunden, oder mittelbar, das heißt kontaktlos und/oder berührungslos, mit einer auf die Motorwelle wirkenden axialen Druckkraft oder axialen Zugkraft beaufschlagt wird.The pump assembly according to the invention comprises at least one arranged outside the motor housing stabilizing element for reducing or eliminating the axial shaft clearance of the motor shaft, wherein the motor shaft by the stabilizing element directly, that is contact-bound, or indirectly, that is contactless and / or contactless, with a on the Motor shaft acting axial compressive force or axial tensile force is applied.
Die Kraftbeaufschlagung der Motorwelle erfolgt somit von außerhalb des Motorgehäuses.The application of force to the motor shaft thus takes place from outside the motor housing.
Die Motorwelle ist auf der Seite der mit dem Motorgehäuse verbundenen Gehäuseeinheit durch das Motorgehäuse hindurch geführt. Die zur Verringerung des axialen Wellenspiels der Motorwelle erforderliche Kraft wird auf das freie Ende der Motorwelle ausgeübt, insbesondere stirnseitig. Die Motorwelle ist im Motorgehäuse mit einem axialen Wellenspiel gelagert und/oder mit einem axialen Wellenspiel im Motorgehäuse geführt. Dies bedeutet, dass die Motorwelle ohne die Kraftbeaufschlagung durch das Stabilisierungselement relativ zum Motorgehäuse (geringfügig) verschiebbar ist. Die Erfindung betrifft somit die Verwendung von Standardmotoren, bei denen es aufgrund des Betriebs der Pumpe zu einer Relativbewegung zwischen der Motorwelle einerseits und einem Außengehäuse des Elektromotors andererseits kommen kann. Dieser Relativbewegung wird erfindungsgemäß durch das wenigstens eine Stabilisierungselement vorgebeugt.The motor shaft is passed through the motor housing on the side of the housing unit connected to the motor housing. The force required to reduce the axial shaft clearance of the motor shaft is exerted on the free end of the motor shaft, in particular on the front side. The motor shaft is mounted in the motor housing with an axial shaft play and / or performed with an axial wave play in the motor housing. This means that the motor shaft is (slightly) displaceable relative to the motor housing without the application of force by the stabilizing element. The invention thus relates to the use of standard motors, in which due to the operation of the pump to a relative movement between the motor shaft on the one hand and an outer casing of the electric motor on the other hand can come. This relative movement is inventively prevented by the at least one stabilizing element.
Der Elektromotor zum Antrieb der Pumpe bzw. der Motorwelle kann im Wesentlichen aus einem feststehenden Teil (Ständer) und einem rotierenden Teil (Läufer) bestehen, wobei der Ständer und der Läufer Dauermagnete oder elektrische Wicklungen aufweisen, die elektrische Felder erzeugen. Dabei ist der Läufer auf der Motorwelle gelagert. Darüber hinaus können elektrische Anschlüsse an wenigstens einen elektrischen Verbraucher oder elektrischen Energieversorger vorgesehen sein. Die elektrischen Anschlüsse sind vorzugsweise auf einer der Gehäuseeinheit abgewandten Seite aus dem Motorgehäuse geführt. Ansonsten, das heißt mit Ausnahme der Durchführungen für die Motorwelle und die elektrischen Anschlüsse, ist das Motorgehäuse vorzugsweise als in sich geschlossen ausgebildet.The electric motor for driving the pump or the motor shaft can essentially consist of a fixed part (stator) and a rotating part (rotor), the stator and the rotor having permanent magnets or electrical windings which generate electric fields. The rotor is mounted on the motor shaft. In addition, electrical connections can be provided to at least one electrical consumer or electrical energy supplier. The electrical connections are preferably guided on a side facing away from the housing unit from the motor housing. Otherwise, that is, with the exception of the bushings for the motor shaft and the electrical connections, the motor housing is preferably designed as self-contained.
Zur Reduzierung der beschriebenen durch die Konstruktion des Elektromotors grundsätzlich möglichen Relativbewegung zwischen der Motorwelle und dem Motorgehäuse ist erfindungsgemäß ein Stabilisierungselement vorgesehen. Das Stabilisierungselement übt eine Kraft, insbesondere eine Axialkraft, aus, die auf das freie Ende der in der Gehäuseeinheit aufgenommenen Motorwelle mittelbar oder unmittelbar wirkt. Dadurch wird das an sich vorhandene axiale Wellenspiel der Motorwelle zumindest verringert, insbesondere gänzlich unterdrückt. Das Motorgehäuse bildet vorzugsweise ein Außengehäuse des Elektromotors und umschließt neben elektromotorischen Bauteilen, wie Ständer und Läufer, insbesondere auch Wellenlager der Motorwelle. Die elektromotorischen Bauteile des Elektromotors und die Wellenlager der Motorwelle sind insbesondere durch das Motorgehäuse gekapselt.To reduce the described by the construction of the electric motor basically possible relative movement between the motor shaft and the motor housing according to the invention a stabilizing element is provided. The stabilizing element exerts a force, in particular an axial force, which acts directly or indirectly on the free end of the motor shaft accommodated in the housing unit. As a result, the axial wave play of the motor shaft which is present per se is at least reduced, in particular completely suppressed. The motor housing preferably forms an outer housing of the electric motor and, in addition to electromotive components, such as stator and rotor, in particular also shaft bearing of the motor shaft. The electromotive components of the electric motor and the shaft bearings of the motor shaft are in particular encapsulated by the motor housing.
Die Motorwelle erstreckt sich zum überwiegenden Teil innerhalb des Motorgehäuses, ist aber mit einem Wellenende durch eine Außenwandung bzw. Stirnseite des Motorgehäuses hindurchgeführt, wobei das hindurchgeführte Wellenende vorzugsweise innerhalb der Gehäuseeinheit angeordnet ist. Die Gehäuseeinheit umschließt dabei vorzugsweise vollständig das freie Ende der Motorwelle. Die Gehäuseeinheit kann mit dem Motorgehäuse insbesondere lösbar verbunden sein, beispielsweise durch Verschrauben. Grundsätzlich kann aber auch eine feste Verbindung zwischen der Gehäuseeinheit und dem Motorgehäuse vorgesehen sein. Insbesondere ist die Gehäuseeinheit vorzugsweise ausschließlich im Bereich der Außenwandung bzw. Stirnseite mit dem Motorgehäuse verbunden, an der die Motorwelle aus dem Motorgehäuse hindurchgeführt ist. Darüber hinaus ist es grundsätzlich auch möglich, dass die Gehäuseeinheit auch das Motorgehäuse umgibt un dieses insbesondere "einkapselt".The motor shaft extends for the most part within the motor housing, but is guided with a shaft end through an outer wall or end face of the motor housing, wherein the guided-shaft end is preferably arranged within the housing unit. The housing unit preferably encloses completely the free end of the motor shaft. The housing unit may in particular be releasably connected to the motor housing, for example by screwing. In principle, however, a fixed connection between the housing unit and the motor housing may be provided. In particular, the housing unit is preferably connected exclusively in the region of the outer wall or front side with the motor housing, on which the motor shaft is guided out of the motor housing. In addition, it is also possible in principle that the housing unit surrounds the motor housing un this particular "encapsulates".
Die Gehäuseeinheit kann ein- oder mehrteilig ausgebildet sein. Vorzugsweise ist die Gehäuseeinheit ein insbesondere spritzgegossenes Kunststoffbauteil. Die Gehäuseeinheit kann lösbar oder fest mit dem Motorgehäuse verbunden sein.The housing unit may be formed in one or more parts. Preferably, the housing unit is a particular injection molded plastic component. The housing unit may be detachably or fixedly connected to the motor housing.
Das axiale Wellenspiel der Motorwelle kann im Nicht-Einbauzustand des Elektromotors, also wenn das Stabilisierungselement (noch) nicht auf die Motorwelle wirkt, vorzugsweise weniger als 2 mm, weiter vorzugsweise weniger als 1 mm, besonders bevorzugt weniger als 500 µm oder auch weniger als 200 µm betragen. Auch ein kleineres axiales Wellenspiel von beispielsweise 50 oder 100 µm lässt sich grundsätzlich durch das erfindungsgemäß vorgesehene Stabilisierungselement verringern oder unterdrücken.The axial wave play of the motor shaft, in the non-installed state of the electric motor, so if the stabilizing element (yet) does not act on the motor shaft, preferably less than 2 mm, more preferably less than 1 mm, more preferably less than 500 microns or less than 200 μm. Even a smaller axial wave play of, for example, 50 or 100 .mu.m can in principle be reduced or suppressed by the stabilizing element provided according to the invention.
Die Erfindung betrifft im Ergebnis das nachträgliche Ertüchtigen eines Standardmotors, dessen Motorwelle an sich spielbehaftet im Motorgehäuse geführt ist, für den Betrieb in einer Pumpenbaugruppe derart, das die Motorwelle in der Pumpenbaugruppe im Wesentlichen spielfrei angeordnet ist. Das grundsätzlich mögliche axiale Wellenspiel der Motorwelle des Elektromotors ist somit zu unterscheiden von der spielfreien Anordnung der Motorwelle im Einbauzustand des Elektromotors und Betriebszustand der Pumpe bzw. innerhalb der Gehäuseeinheit.As a result, the invention relates to the retrofitting of a standard motor, the motor shaft of which is guided in play in the motor housing, for operation in a pump assembly in such a way that the motor shaft in the pump assembly is arranged substantially free of play. The basically possible axial shaft play of the motor shaft of the electric motor is thus to be distinguished from the backlash-free arrangement of the motor shaft in the installed state of the electric motor and operating state of the pump or within the housing unit.
Unter der Formulierung "außerhalb des Motorgehäuses" sind erfindungsgemäß alle Ausführungsformen zu verstehen, bei denen das Stabilisierungselement außerhalb von dem die Motorwelle umgebenden Innenraum des Motorgehäuses angeordnet ist. Die Formulierung "außerhalb des Motorgehäuses" umfasst insbesondere auch solche Ausführungsformen, bei denen das Stabilisierungselement in das Motorgehäuse integriert ist oder einen Teil des Motorgehäuses bildet, wobei jedoch die Motorwelle durch das Stabilisierungselement von außerhalb des Motorgehäuses mit einer axialen Druckkraft oder axialen Zugkraft beaufschlagt wird, um ein konstruktionsbedingtes Wellenspiel der Motorwelle zu verringern oder vollständig zu beseitigen. Der Erfindung liegt der Grundgedanke zugrunde, durch das Stabilisierungselement eine Lagerung bzw. Stützlagerung der Motorwelle von außerhalb des Motorgehäuses bereitzustellen.The term "outside the motor housing" according to the invention all embodiments are to be understood, in which the stabilizing element is arranged outside of the motor shaft surrounding the interior of the motor housing. The term "outside of the motor housing" also includes in particular such embodiments in which the stabilizing element is integrated in the motor housing or forms part of the motor housing, but the motor shaft is acted upon by the stabilizing element from outside the motor housing with an axial compressive force or axial tensile force, to reduce or completely eliminate a design-related shaft play of the motor shaft. The invention is based on the basic idea to provide a storage or support bearing of the motor shaft from outside the motor housing by the stabilizing element.
Der Elektromotor mit Motorgehäuse und spielbehafteter Motorwelle stellt dabei eine konstruktive vormontierte Baugruppe bzw. ein in die Pumpenbaugruppe integriertes separates Bauteil da. Erfindungsgemäß ist eine konstruktive Modifikation bzw. Änderung des Aufbaus des Elektromotors nicht erforderlich, um das immanente Wellenspiel der Motorwelle zu verringern oder zu beseitigen. Dadurch lassen sich auch bei Einsatz kostengünstiger Elektromotoren, die eine in axialer Richtung beweglich gelagerte Motorwelle aufweisen, störende Geräusche oder Vibrationen für jede Einbau- und/oder Gebrauchslage der Pumpe ausschließen oder zumindest verringern, die ansonsten beim Motorbetrieb solcher Motoren durch Relativbewegungen der Motorwelle zum Motorgehäuse auftreten können.The electric motor with motor housing and play-loaded motor shaft thereby provides a constructive preassembled module or a separate component integrated in the pump module. According to the invention, a structural modification of the structure of the electric motor is not required to reduce or eliminate the immanent wave play of the motor shaft. This can also be done when using cost-effective electric motors having a motor shaft movably mounted in the axial direction, exclude or at least reduce disturbing noises or vibrations for each installation and / or use position of the pump, which may otherwise occur during motor operation of such motors by relative movements of the motor shaft to the motor housing.
Die Beseitigung des axialen Wellenspiels erfolgt erfindungsgemäß unter Einfluss des Stabilisierungselementes in der Einbaulage des Elektromotors. Es kann wenigstens ein Stabilisierungselement vorgesehen sein, das in und/oder an der Gehäuseeinheit befestigt ist und/oder einen Teil der Gehäuseeinheit bildet. Alternativ oder ergänzend kann wenigstens ein Stabilisierungselement vorgesehen sein, das mit der Motorwelle verbunden und mit der Motorwelle drehbar ist. Weiter alternativ oder ergänzend kann wenigstens ein Stabilisierungselement vorgesehen sein, das in und/oder an dem Motorgehäuse befestigt ist und/oder ein Teil des Motorgehäuses bildet. Dabei kann es sich bei dem Stabilisierungselement vorzugsweise um ein separates Bauteil handeln, das mit der Gehäuseeinheit oder der Motorwelle oder dem Motorgehäuse verbunden ist. Grundsätzlich kann das Stabilisierungselement aber auch durch einen entsprechend ausgebildeten Gehäuseabschnitt der Gehäuseeinheit oder des Motorgehäuses gebildet werden. Durch eine entsprechende Dimensionierung und Anordnung des Stabilisierungselementes innerhalb der Pumpenbaugruppe, insbesondere durch eine bestimmte Beabstandung des Stabilisierungselements von der Motorwelle auf der Antriebsseite der Motorwelle, ist eine Verringerung oder Beseitigung von Störgeräuschen und/oder Vibrationen bei gleichbleibender Baugröße der Pumpenbaugruppe möglich.The elimination of the axial wave play occurs according to the invention under the influence of the stabilizing element in the installation position of the electric motor. At least one stabilizing element may be provided, which is fastened in and / or on the housing unit and / or forms part of the housing unit. Alternatively or additionally, at least one stabilizing element may be provided which is connected to the motor shaft and rotatable with the motor shaft. Further alternatively or additionally, at least one stabilizing element can be provided, which is fastened in and / or on the motor housing and / or forms part of the motor housing. In this case, the stabilizing element can preferably be a separate component which is connected to the housing unit or the motor shaft or the motor housing. In principle, however, the stabilizing element can also be formed by a correspondingly formed housing section of the housing unit or of the motor housing. By an appropriate dimensioning and arrangement of the stabilizing element within the pump assembly, in particular by a certain spacing of the stabilizing element of the motor shaft on the drive side of the motor shaft, a reduction or elimination of noise and / or vibration while maintaining the size of the pump assembly is possible.
Bei der Erfindung wird die Motorwelle durch das Stabilisierungselement mit einer in axialer Richtung der Motorwelle wirkenden Druck- oder Zugkraft beaufschlagt. Aufgrund der Kraftausübung in axialer Richtung können beim Motorbetrieb auftretende und auf ein immanentes Axialspiel der Motorwelle zurückzuführende Störgeräusche und/oder Vibrationen deutlich verringert oder sogar vollständig beseitigt werden. Die Kräfte können zu einer Vorspannung der Motorwelle im Motorgehäuse und/oder zu einer axialen Verschiebung der Motorwelle im Motorgehäuse führen. Durch Druck- oder Zugkräfte kann die Motorwelle in eine Stellung gebracht werden, in der sie beim Motorbetrieb nicht mehr gegen feststehende Bauteile des Elektromotors anliegt. Die Motorwelle kann durch das Stabilisierungselement auch mit einem Wellenende gegen ein Wellenlager im Motorgehäuse gedrückt werden, so dass beim Motorbetrieb keine relevanten Störgeräusche oder Vibrationen auftreten. Für eine Beseitigung des axialen Wellenspiels der Motorwelle kann es insbesondere vorgesehen sein, dass die Motorwelle aufgrund der Wirkung des Stabilisierungselementes gegen ein gegenüberliegend zur Antriebsseite des Motors im Inneren des Motorgehäuses angeordnetes Wellenlager gedrückt oder gegen ein innenliegendes Wellenlager auf der Antriebsseite des Elektromotors gezogen wird. Das erfindungsgemäße Verfahren sieht in diesem Zusammenhang vor, dass von außen eine auf die Motorwelle wirkende axiale Druck- oder Zugkraft erzeugt wird, um das axiale Wellenspiel zu verringern oder zu beseitigen. Damit lässt sich das Entstehen von Vibrationen und/oder Störgeräuschen beim Pumpenbetrieb in sehr effektiver Weise und unter Ausnutzung der im Inneren der Gehäuseeinheit zur Verfügung stehenden Freiräume verringern oder sogar vollständig beseitigen, ohne dass eine konstruktive Änderung der Baugruppe "Elektromotor" erforderlich ist.In the invention, the motor shaft is acted upon by the stabilizing element with a compressive or tensile force acting in the axial direction of the motor shaft. Due to the exertion of force in the axial direction occurring during engine operation and attributable to an immanent axial play of the motor shaft noise and / or vibrations can be significantly reduced or even completely eliminated. The forces can lead to a bias of the motor shaft in the motor housing and / or to an axial displacement of the motor shaft in the motor housing. By pressure or tensile forces, the motor shaft can be brought into a position in which it no longer rests against fixed components of the electric motor during engine operation. The motor shaft can be pressed by the stabilizing element with a shaft end against a shaft bearing in the motor housing, so that no relevant noise or vibration occur during engine operation. In particular, for eliminating the axial shaft clearance of the motor shaft be provided that the motor shaft is pressed due to the action of the stabilizing element against an opposite to the drive side of the motor in the interior of the motor housing arranged shaft bearing or pulled against an internal shaft bearing on the drive side of the electric motor. In this context, the method according to the invention provides that an axial compressive or tensile force acting on the motor shaft is generated from the outside in order to reduce or eliminate the axial shaft clearance. This can be the occurrence of vibration and / or noise during pump operation in a very effective manner and taking advantage of the available inside the housing unit free space or even completely eliminate it, without a constructive change of the assembly "electric motor" is required.
Bei einer Ausführungsform der Erfindung kann das Stabilisierungselement federbelastet sein oder es ist ein Federmittel als Stabilisierungselement vorgesehen, das eine in axialer Richtung der Motorwelle auf die Motorwelle wirkende Federkraft erzeugt. Über das Federelement kann ein Gehäuseteil der Gehäuseeinheit oder ein Gehäuseabschnitt des Motorgehäuses mit der Motorwelle mechanisch gekoppelt sein. Beispielsweise kann zwischen dem Motorgehäuse und einem mit der Motorwelle fest verbundenen Exzenter ein Federelement vorgesehen sein, um die Motorwelle durch die Federkraft vom Motorgehäuse weg zu drücken oder zum Motorgehäuse zu ziehen. Es versteht sich, dass alternativ auch ein Federelement zwischen einem Gehäuseteil der Gehäuseeinheit und dem Exzenter der Motorwelle vorgesehen sein kann, um die Motorwelle entsprechend vorzuspannen.In one embodiment of the invention, the stabilizing element may be spring-loaded or there is provided a spring means as a stabilizing element which generates a spring force acting on the motor shaft in the axial direction of the motor shaft. By way of the spring element, a housing part of the housing unit or a housing section of the motor housing can be mechanically coupled to the motor shaft. For example, may be provided between the motor housing and a fixedly connected to the motor shaft eccentric a spring element to push the motor shaft by the spring force from the motor housing away or to pull the motor housing. It is understood that alternatively, a spring element between a housing part of the housing unit and the eccentric motor shaft may be provided to bias the motor shaft accordingly.
Bei einer bevorzugten Ausführungsform der Erfindung ist das Stabilisierungselement auf der Antriebsseite des Elektromotors an und/oder in einem der freistehenden Stirnseite der Motorwelle gegenüberliegenden Gehäuseteil der Gehäuseeinheit angeordnet. Insbesondere kann das Stabilisierungselement an und/oder in einem Gehäusedeckel oder einer Gehäusekappe angeordnet sein, der bzw. die lösbar und/oder verschiebbar mit wenigstens einem anderen Gehäuseteil der Gehäuseeinheit verbunden ist. Der freistehende, durch das Motorgehäuse des Elektromotors herausragende Teil der Motorwelle kann in der Gehäuseeinheit gekapselt sein, wenn der Gehäusedeckel in eine Schließ- und Montagestellung gebracht ist. Durch Öffnen des Gehäusedeckels ist ein einfacher Zugriff auf das Stabilisierungselement und/oder das freistehende Wellenende der Motorwelle möglich. Im geschlossenen Zustand des Gehäusedeckels sind dagegen das Stabilisierungselement und das freie Ende der Motorwelle gegen Verschmutzungen geschützt. Die Befestigung des Stabilisierungselementes an und/oder in einem der Motorwelle stirnseitig gegenüberliegenden Gehäuseteil ermöglicht in konstruktiv einfacher Weise und bei gleichbleibender Baugröße der Pumpe die Übertragung ausreichend großer axialer Druck- und/oder Zugkräfte von dem Stabilisierungselement auf die Motorwelle. Hierbei ist das Stabilisierungselement sicher an oder in dem Gehäuseteil gehalten.In a preferred embodiment of the invention, the stabilizing element on the drive side of the electric motor and / or in a free-standing end face of the motor shaft opposite housing part of the housing unit is arranged. In particular, the stabilizing element may be arranged on and / or in a housing cover or a housing cap which is releasably and / or displaceably connected to at least one other housing part of the housing unit. The free-standing, protruding through the motor housing of the electric motor part of the motor shaft may be encapsulated in the housing unit when the housing cover is brought into a closed and assembled position. By opening the housing cover a simple access to the stabilizing element and / or the freestanding shaft end of the motor shaft is possible. In the closed state of the housing cover, however, the stabilizing element and the free end of the motor shaft are protected against contamination. The attachment of the stabilizing element to and / or in one of the motor shaft frontally opposite Housing part allows in a structurally simple manner and with a constant size of the pump, the transmission of sufficiently large axial pressure and / or tensile forces from the stabilizing element on the motor shaft. Here, the stabilizing element is securely held on or in the housing part.
Bei einer ersten Ausführungsform der erfindungsgemäßen Pumpenbaugruppe liegt das Stabilisierungselement mittelbar oder unmittelbar stirnseitig gegen die Motorwelle an. Es kommt dann zu einer kontaktgebundenen Verringerung des axialen Wellenspiels, wobei die Motorwelle durch das Stabilisierungselement auf die von der Antriebsseite des Elektromotors abgewandte Motorseite gedrängt und/oder mit einer in axialer Richtung zur abgewandten Motorseite wirkenden Vorspannung beaufschlagt wird.In a first embodiment of the pump assembly according to the invention, the stabilizing element is directly or indirectly against the end face of the motor shaft. It comes then to a contact-bound reduction of the axial shaft clearance, wherein the motor shaft is urged by the stabilizing element on the side facing away from the drive side of the electric motor side of the motor and / or acted upon by an acting in the axial direction to the opposite side motor bias.
Um einen niedrigen Gleitreibungswiderstand zu erreichen, kann das Stabilisierungselement für die Kraftübertragung im Wesentlichen punktförmig gegen die Motorwelle anliegen. Insbesondere kann das Stabilisierungselement kugelförmig ausgebildet sein. Alternativ kann vorgesehen sein, dass das Stabilisierungselement in Richtung zur Antriebsseite des Elektromotors spitz zulaufend ausgebildet ist, so dass das Stabilisierungselement mit seiner Spitze gegen die Motorwelle wirkt. Auch dadurch lässt sich ein geringer Gleitreibungswiderstand bei der Drehung der Motorwelle sicherstellen.In order to achieve a low sliding friction resistance, the stabilizing element for the transmission of force can abut substantially punctually against the motor shaft. In particular, the stabilizing element may be spherical. Alternatively it can be provided that the stabilizing element is designed tapering in the direction of the drive side of the electric motor, so that the stabilizing element acts with its tip against the motor shaft. This also ensures a low sliding friction resistance during rotation of the motor shaft.
Alternativ oder ergänzend kann der durch Gleitreibung zwischen dem Stabilisierungselement und der Motorwelle verursachte Widerstand durch Wahl einer reibungsarmen Materialpaarung niedrig gehalten werden. Das Stabilisierungselement kann in diesem Zusammenhang aus einem Material mit guten Gleit- und Verschleißeigenschaften, beispielsweise aus Polyoxymethylen (POM) und/oder Polytetrafluorethylen (PTFE), bestehen. Die vorgenannten Materialien lassen auch eine kostengünstige Fertigung des Stabilisierungselementes zu. Grundsätzlich besteht jedoch auch die Möglichkeit, das Stabilisierungselement aus einem keramischen Werkstoff und/oder aus Carbon zu fertigen, um einen geringen Gleitreibungswiderstand zwischen dem Stabilisierungselement und der Motorwelle zu gewährleisten.Alternatively or additionally, the resistance caused by sliding friction between the stabilizing element and the motor shaft can be kept low by choosing a low-friction material pairing. The stabilizing element may in this context consist of a material having good sliding and wear properties, for example of polyoxymethylene (POM) and / or polytetrafluoroethylene (PTFE). The aforementioned materials also allow a cost-effective production of the stabilizing element. In principle, however, it is also possible to manufacture the stabilizing element from a ceramic material and / or from carbon in order to ensure a low sliding friction resistance between the stabilizing element and the motor shaft.
Um einen Leistungsverlust der Pumpe aufgrund der Kraftbeaufschlagung der Motorwelle mit dem Stabilisierungselement gering zu halten, kann das Stabilisierungselement auch drehbar an dem Gehäuseteil gehalten bzw. gelagert sein. Beim Motorbetrieb kann es dann aufgrund der gegen das Stabilisierungselement anliegenden Motorwelle zu einer Relativbewegung zwischen dem Stabilisierungselement und dem Gehäuseteil kommen, wobei das Stabilisierungselement mit der Motorwelle mitbewegt werden kann.In order to keep a power loss of the pump due to the application of force to the motor shaft with the stabilizing element low, the stabilizing element can also be rotatably held or mounted on the housing part. During engine operation, it may then due to the voltage applied to the stabilizing element motor shaft to a relative movement between the stabilizing element come and the housing part, wherein the stabilizing element can be moved with the motor shaft.
Es versteht sich zudem, dass grundsätzlich auch ein Stabilisierungselement an einem Gehäuseabschnitt des Motorgehäuses gehalten sein kann, das gegen einen mit dem freien Ende der Motorwelle verbundenen Exzenter anliegt und/oder gegen den Exzenter wirkt. Über das Stabilisierungselement kann dann eine Druckkraft auf den Exzenter ausgeübt werden, um die Motorwelle in eine vom Motorgehäuse abgewandte Richtung zu drücken und so das axiale Wellenspiel zu verringern. Das Stabilisierungselement kann auch hier vorzugsweise punktförmig, weiter vorzugsweise als Kugel, ausgebildet sein. Im Übrigen kann das Stabilisierungselement ebenfalls drehbar an dem Gehäuseabschnitt des Motorgehäuses gehalten sein und/oder aus einem verschleißarmen Material bestehen.It is also understood that in principle, a stabilizing element may be held on a housing portion of the motor housing, which abuts against an eccentric connected to the free end of the motor shaft and / or acts against the eccentric. A pressure force can then be exerted on the eccentric via the stabilizing element in order to press the motor shaft in a direction away from the motor housing and thus reduce the axial shaft play. The stabilizing element may also here preferably be punctiform, more preferably formed as a ball. Incidentally, the stabilizing element may also be rotatably held on the housing portion of the motor housing and / or consist of a low-wear material.
Für eine langzeitstabile Übertragung von Druckkräften von dem Stabilisierungselement auf die Motorwelle kann das Stabilisierungselement mit einer Federkraft beaufschlagt sein. Das Stabilisierungselement kann durch ein Federelement in axialer Richtung zur Motorwelle hin vorgespannt sein. Damit ist ein Wirkkontakt zwischen dem Stabilisierungselement und der Motorwelle stets gewährleistet, auch wenn es aufgrund einer beim Motorbetrieb auftretenden rotatorischen Relativbewegung zwischen der Motorwelle und dem gegen die Motorwelle anliegenden Stabilisierungselement zu einem Verschleiß am Stabilisierungselement kommt.For a long-term stable transmission of compressive forces from the stabilizing element on the motor shaft, the stabilizing element may be acted upon by a spring force. The stabilizing element can be biased by a spring element in the axial direction towards the motor shaft. In order for an effective contact between the stabilizing element and the motor shaft is always guaranteed, even if it comes to a wear on the stabilizing element due to a rotational relative movement between the motor shaft and the voltage applied to the motor shaft occurring during motor operation.
Zur Erzeugung der Federkraft kann beispielsweise eine Membran aus einem elastischen Kunststoff an einem Gehäuseteil der Gehäuseeinheit vorgesehen sein, die gegen das Stabilisierungselement anliegt und durch die das Stabilisierungselement in Richtung zur Motorwelle hin gedrückt wird. Alternativ kann auch das Gehäuseteil als solches aus einem elastomeren Kunststoff gefertigt sein und das Stabilisierungselement vorspannen. Weiter alternativ kann auch ein Federelement, beispielsweise eine Schraubenfeder, vorgesehen sein, um das Stabilisierungselement gegen die Motorwelle anzudrücken.To generate the spring force, for example, a diaphragm made of an elastic plastic may be provided on a housing part of the housing unit, which bears against the stabilizing element and through which the stabilizing element is pressed in the direction of the motor shaft. Alternatively, the housing part can be made as such from an elastomeric plastic and bias the stabilizing element. Furthermore alternatively, a spring element, for example a helical spring, may be provided in order to press the stabilizing element against the motor shaft.
Bei einer alternativen Ausführungsform der Erfindung kann eine magnetische Kopplung zwischen der Motorwelle und der Gehäuseeinheit und/oder zwischen der Motorwelle und dem Motorgehäuse zur Verringerung oder zur Beseitigung des axialen Wellenspiels der Motorwelle vorgesehen sein. Die Kopplung wird von außerhalb des an sich geschlossenen Motorgehäuses auf das aus dem Motorgehäuse herausgeführte Wellenende der Motorwelle durchgeführt. Bei dieser Ausführungsform wird die Motorwelle zur Verringerung oder zur Beseitigung des Wellenspiels durch magnetische Feldkräfte berührungslos in einer bestimmten Axialstellung gehalten. Es wird ein Magnetfeld in axialer Richtung erzeugt, dass die Motorwelle anzieht oder abstößt, um das der Baueinheit "Elektromotor" immanente axiale Wellenspiel zu verringern und, vorzugsweise, zu beseitigen. Aufgrund der magnetischen Kopplung ist eine reibungsfreie und damit verschleiß- und annähernd leistungsverlustfreie Übertragung der zur Verringerung oder Beseitigung des axialen Wellenspiels der Motorwelle erforderlichen Kräfte möglich. Im Übrigen lässt sich eine Magnetkopplung in einfacher Weise konstruktiv ausgestalten und kostengünstig fertigen.In an alternative embodiment of the invention, a magnetic coupling may be provided between the motor shaft and the housing unit and / or between the motor shaft and the motor housing to reduce or eliminate the axial shaft clearance of the motor shaft. The coupling is carried out from outside the self-contained motor housing on the guided out of the motor housing shaft end of the motor shaft. In this embodiment the motor shaft is held without contact in a specific axial position to reduce or eliminate the wave play by magnetic field forces. A magnetic field is generated in the axial direction that attracts or repels the motor shaft in order to reduce and, preferably, eliminate the axial wave play inherent in the "electric motor" assembly. Due to the magnetic coupling a frictionless and thus wear and almost loss of power transmission of the forces required to reduce or eliminate the axial shaft clearance of the motor shaft is possible. Incidentally, a magnetic coupling in a simple way constructively design and manufacture cost-effective.
Um unabhängig von einer Stromversorgung ein ausreichend starkes Magnetfeld zu erzeugen, kann als Stabilisierungselement wenigstens ein Dauermagnet, beispielsweise ausgebildet als Scheibenmagnet oder Ringmagnet, vorgesehen sein oder das Stabilisierungselement kann wenigstens einen solchen Dauermagneten aufweisen. Auch eine elektromagnetische Kopplung ist grundsätzlich möglich. Beispielsweise kann in und/oder an der Gehäuseeinheit und/oder in und/oder an dem Motorgehäuse ein magnetisches Stabilisierungselement angeordnet bzw. gehalten sein oder es kann ein magnetisches Stabilisierungselement direkt mit der Motorwelle verbunden sein. Zur Ausbildung der magnetischen Kopplung können wenigstens zwei magnetische Stabilisierungselemente zusammenwirken oder ein Stabilisierungselement kann mit einem aus einem ferromagnetischen Material bestehenden Bereich oder Abschnitt oder Teil der Gehäuseeinheit oder des Motorgehäuses oder der Motorwelle zusammenwirken. Beispielsweise kann ein konzentrisch zur Motorwelle angeordneter und fest mit der Motorwelle verbundener Ringmagnet vorgesehen sein, der mit einem weiteren an der Gehäuseeinheit oder dem Motorgehäuse befestigten Dauermagneten zusammenwirkt. Gegenüberliegende Magnetpole der Stabilisierungselemente können eine gleiche oder entgegengesetzte Polarität aufweisen, um die Stabilisierungselemente voneinander wegzudrücken oder gegenseitig anzuziehen.In order to generate a sufficiently strong magnetic field independently of a power supply, at least one permanent magnet, for example formed as a disk magnet or ring magnet, may be provided as the stabilizing element, or the stabilizing element may comprise at least one such permanent magnet. An electromagnetic coupling is possible in principle. For example, a magnetic stabilizing element can be arranged or held in and / or on the housing unit and / or in and / or on the motor housing, or a magnetic stabilizing element can be connected directly to the motor shaft. To form the magnetic coupling, at least two magnetic stabilizing elements may cooperate, or a stabilizing element may cooperate with a portion or portion of the housing unit or the motor housing or motor shaft made of a ferromagnetic material. For example, a concentric with the motor shaft arranged and fixedly connected to the motor shaft ring magnet may be provided, which cooperates with a further fixed to the housing unit or the motor housing permanent magnet. Opposing magnetic poles of the stabilizing elements may have the same or opposite polarity to push the stabilizing elements away from one another or to attract one another.
Ein Dauermagnet als Stabilisierungselement kann konzentrisch zur Motorwelle angeordnet sein. Darüber hinaus ist es möglich, dass ein Dauermagnet mit der zusätzlichen Funktion eines Ausgleichsgewichts radial versetzt zur Motorwelle angeordnet ist. Bei einer Exzenterpumpe mit einem mit dem freien Ende der Motorwelle verbundenen Exzenter kann wenigstens ein Magnet an der Stelle eines Stabilisierungselementes in den Exzenter integriert sein. Bestehen Ausgleichsgewichte im Exzenter aus einem ferromagnetischen Material, können diese mit einem mit der Gehäuseeinheit oder dem Motorgehäuse verbundenen dauermagnetischen Stabilisierungselement zusammenwirken, um eine magnetische Kopplung zwischen der Gehäuseeinheit und der Motorwelle oder zwischen dem Motorgehäuse und der Motorwelle zu erreichen. Mit dem freien Ende der Motorwelle kann auch eine Scheibe aus einem ferromagnetischen Material fest verbunden sein, die beispielsweise von einem dauermagnetischen Stabilisierungselement an der Gehäuseeinheit oder von einem dauermagnetischen Stabilisierungselement an dem Motorgehäuse angezogen wird, um dadurch die Motorwelle in eine bestimmte Richtung zu bewegen und das Axialspiel der Motorwelle zu verringern.A permanent magnet as a stabilizing element can be arranged concentrically to the motor shaft. Moreover, it is possible that a permanent magnet with the additional function of a balance weight is arranged radially offset from the motor shaft. In an eccentric pump with an eccentric connected to the free end of the motor shaft, at least one magnet can be integrated in the eccentric at the location of a stabilizing element. If balance weights in the eccentric are made of a ferromagnetic material, they can be combined with one with the Housing unit or the motor housing associated permanent magnetic stabilizing element cooperate to achieve a magnetic coupling between the housing unit and the motor shaft or between the motor housing and the motor shaft. To the free end of the motor shaft and a disc of a ferromagnetic material may be fixedly connected, which is attracted for example by a permanent magnet stabilizing element to the housing unit or by a permanent magnet stabilizing element on the motor housing, thereby moving the motor shaft in a certain direction and the Reduce axial play of the motor shaft.
In der Zeichnung ist die Erfindung anhand von Ausführungsbeispielen näher veranschaulicht. Es zeigen
- Fig. 1
- eine schematische Ansicht einer ersten Ausführungsform einer erfindungsgemäßen Pumpenbaugruppe mit einer Gehäuseeinheit und einem Elektromotor, wobei eine mechanische Kopplung zwischen der Gehäuseeinheit und einer Motorwelle des Elektromotors vorgesehen ist,
- Fig. 2
- eine schematische Ansicht einer zweiten Ausführungsform einer erfindungsgemäßen Pumpenbaugruppe mit einer magnetischen Kopplung zwischen der Gehäuseeinheit und der Motorwelle und
- Fig. 3
- eine schematische Ansicht einer weiteren Ausführungsform einer erfindungsgemäßen Pumpenbaugruppe mit einer magnetischen Kopplung zwischen der Motorwelle und dem Motorgehäuse.
- Fig. 1
- 1 is a schematic view of a first embodiment of a pump assembly according to the invention with a housing unit and an electric motor, wherein a mechanical coupling between the housing unit and a motor shaft of the electric motor is provided,
- Fig. 2
- a schematic view of a second embodiment of a pump assembly according to the invention with a magnetic coupling between the housing unit and the motor shaft and
- Fig. 3
- a schematic view of another embodiment of a pump assembly according to the invention with a magnetic coupling between the motor shaft and the motor housing.
Das Motorgehäuse weist auf einer Antriebsseite des Elektromotors 2 eine Gehäuseöffnung für die Motorwelle 5 auf, durch die die Motorwelle 5 hindurchgeführt ist. Die Lagerung der Motorwelle 5 kann über Sinterlager erfolgen, die lediglich zur Aufnahme von Radialkräften ausgebildet sind. Bei solchen Elektromotoren 2 können an der Motorwelle 5 Bauteile vorgesehen sein, die sich zusammen mit der Motorwelle 5 drehen und in Abhängigkeit von der Anordnung und Ausrichtung des Elektromotors 2 beim Pumpenbetrieb axial gegen das Motorgehäuse oder eine Wellenlagerung im Motorgehäuse arbeiten. Dies kann zu störenden Vibrationen und Geräuschen führen. Durch die Verbindung des Elektromotors 2 mit der Gehäuseeinheit 3 werden Vibrationen auf die Gehäuseeinheit 3 übertragen und, insbesondere dann, wenn eine körpernahe Anordnung der Membranpumpe beim Pumpenbetrieb erforderlich ist, als störend wahrgenommen.The motor housing has on a drive side of the electric motor 2 a housing opening for the
Um Vibrationen und/oder Störgeräusche zu vermeiden, beispielsweise bei Kippen der Exzenter-Membranpumpe, wenn die Motorwelle 5 aus einer beispielsweise horizontalen Lage gebracht wird, weist die dargestellte Pumpenbaugruppe 1 ein Stabilisierungselement 6 auf, das in Form einer Kugel als Stützlager für die Motorwelle 5 dient und unmittelbar stirnseitig gegen das freiliegende Ende der Motorwelle 5 anliegt. Durch das Stabilisierungselement 6 wird die Motorwelle 5 in axialer Richtung X (
Wie sich weiter aus
Die Motorwelle ist in an sich üblicher Weise drehfest mit einem Exzenter 10 verbunden. Der Exzenter 10 ist über ein Kugellager 11 ebenfalls in an sich üblicher Weise mit einer Pleuelstange 12 verbunden, um eine Verbindung mit einer nicht gezeigten Membran der Membranpumpe herzustellen und die Pumpenfunktion zu gewährleisten.The motor shaft is rotatably connected in a conventional manner with an eccentric 10. The eccentric 10 is also connected via a
In
Abweichend zu der in
Im Übrigen versteht es sich, dass das Stabilisierungselement 13 und das weitere Stabilisierungselement 14 auf den einander zugewandten Seiten auch unterschiedlich polarisiert sein können, so dass die Motorwelle 5 in Richtung zu dem Gehäusedeckel 4 gezogen wird, was in Abhängigkeit von der konstruktiven Ausgestaltung der Wellenlagerung im Elektromotor 2 ebenfalls zur Verringerung, vorzugsweise zur vollständigen Beseitigung, eines immanenten axialen Lagerspiels der Motorwelle 5 innerhalb des Motorgehäuses führen kann.Incidentally, it is understood that the stabilizing
Das weitere Stabilisierungselement 14 ist in den Exzenter 10 stirnseitig integriert. Zu diesem Zweck weist der Exzenter 10 eine entsprechende Ringnut auf, in die das weitere Stabilisierungselement 14 eingesetzt ist. Die konzentrische Anordnung des Ringmagneten trägt zu einer hohen Laufruhe des Elektromotors 2 bei.The further stabilizing
Nicht dargestellt ist, dass der Exzenter 10 stirnseitig radial versetzt zur Motorwelle angeordnete Ausgleichsgewichte aufweisen kann, die als Stabilisierungselemente vorgesehen sind und durch Dauermagneten gebildet werden können. Auch hiermit lässt sich eine magnetische Kopplung zwischen der Gehäuseeinheit 3 und der Motorwelle 5 erreichen.It is not shown that the eccentric 10 may have radially offset from the motor shaft arranged end side balancing weights, which are provided as stabilizing elements and can be formed by permanent magnets. This also makes it possible to achieve a magnetic coupling between the
Es kann auch lediglich ein Stabilisierungselement 13, 14 vorgesehen sein, das mit einem ferromagnetischen Bereich, Abschnitt oder Teil des Gehäusedeckels 4 oder der Motorwelle 5 zusammenwirkt. Bei der in
Alternativ kann auch ein magnetisches Feld zwischen einem am Exzenter 10 fixierten Permanentmagneten und einem am Motorgehäuse fixierten Permanentmagneten erzeugt werden, um ein Axialspiel der Motorwelle 5 zu verringern oder zu beseitigen.Alternatively, a magnetic field can also be generated between a permanent magnet fixed to the eccentric 10 and a permanent magnet fixed to the motor housing, in order to reduce or eliminate axial play of the
In
Bei der in
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DE102016012252.8A DE102016012252A1 (en) | 2016-07-13 | 2016-10-14 | Pump assembly for a pump, pump and method for reducing or eliminating noise and / or vibration in pumps |
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CN109412336A (en) * | 2018-12-06 | 2019-03-01 | 浙江江宇电机有限公司 | Electric motor and controller method |
CN115038868A (en) * | 2019-12-11 | 2022-09-09 | Nidec全球电器巴西有限公司 | Reciprocating hermetic compressor with axial flow motor |
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CN115038868A (en) * | 2019-12-11 | 2022-09-09 | Nidec全球电器巴西有限公司 | Reciprocating hermetic compressor with axial flow motor |
CN115038868B (en) * | 2019-12-11 | 2024-04-05 | Nidec全球电器巴西有限公司 | Reciprocating hermetic compressor with axial flow motor |
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